Summary

Fixes #107

STLTMemory._process_step_core() discards popped short-term entries without passing them to the LLM for summarization. Instead, _build_consolidation_prompt() formats the remaining active short-term memories — so the LLM redundantly summarizes memories that are still in short-term, while the evicted ones are permanently lost.

Root Cause

1. self.short_term_memory.popleft() discards the entry (return value is ignored)
2. Only one entry is popped even when consolidation_capacity could be > 1
3. _build_consolidation_prompt() sends the remaining short-term memories to the LLM — the evicted entries are never seen

Changes

• _process_step_core(): Now captures all evicted entries (up to consolidation_capacity) in a list and returns them alongside the new entry
• _build_consolidation_prompt(evicted_entries): Accepts the evicted entries and constructs a prompt asking the LLM to integrate them into the existing long-term summary
• _update_long_term_memory(evicted_entries) / _aupdate_long_term_memory(evicted_entries): Updated signatures to receive and forward evicted entries
• process_step() / aprocess_step(): Pass evicted entries to the consolidation methods
• Tests: Updated existing test_update_long_term_memory and test_long_term_memory_stores_string_not_response_object to match new signatures; added test_consolidation_receives_evicted_entries regression test

Before vs After

Test Plan

• All 263 existing tests pass
• 1 new regression test for consolidation behavior
• Pre-commit hooks pass (ruff, codespell)